Cell membranes do all of the following EXCEPT
A) isolate the cell's contents from the external environment.
B) provide attachments between cells.
C) regulate the movement of substances between the cytoplasm of the cell and the extracellular fluid.
D) allow communication between cells.
E) provide an energy source for the cell.
E
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The graph below shows the rate of transport for each substance when the cells are placed in 0.10 mM solutions of A, B, and C. Based on these data and coupled with the data observed above, substance C is transported via ________.
A) active transport
B) facilitated transport
C) passive transport
D) simple diffusion
E) choices A, B, and C
In eukaryotes, pyruvate is converted to acetyl CoA
A) in the cellular cytosol. B) when passing through the mitochondrial outer membrane. C) in the intermembrane space. D) when passing the mitochondrial cristae. E) in the mitochondrial matrix.
The primary, natural habitat of a pathogen where it continues to exist is called the ________.
A. fomite B. source C. reservoir D. vector E. carrier
According to the text, ____ major mass
extinction(s) and recovery(ies) has(have) taken place in the past. a. 1 b. 2 c. 3 d. 4 e. 5